Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1996-08-01
2000-02-22
McMahon, Timothy
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
422177, 4232391, 4232405, 4232453, B01D 5000
Patent
active
060276975
ABSTRACT:
In a method for treating a combustion exhaust gas from a waste burning facility, the exhaust gas has its temperature lowered to 180-230.degree. C., in a temperature lowering unit, is freed of dust in a dry dust collector, passed through a dioxin and NOx removing unit using a vanadium oxide-based catalyst and, thereafter, the exhaust gas at 180-230.degree. C. is further passed through a heat exchanger to effect heat recovery. The vanadium oxide-based catalyst is a vanadium oxide alone or the combination thereof either with an oxide of at least one element selected from the group consisting of molybdenum, tin, yttrium, boron and lead or with gold. In addition, a tungsten oxide may be used. These catalysts are preferably carried on titania for use. The method and an apparatus for implementing it require a simple system configuration and yet assure high thermal efficiency while achieving efficient removal of dioxins and nitrogen oxides.
REFERENCES:
patent: 5512259 (1996-04-01), Hagenmaier et al.
Toshihara Inaba et al, "15-9 Research upon the Decomposition Behavior of Organic Chlorine Compounds in Exhaust Gases (2.sup.nd Report)", Lecture Papers of the 8.sup.th Wastes Society Research Publication in 1997, (English translation provided).
Kankyo Kanri et al, "Mechanism of the Generation of Dioxins at the Process of Combustion", vol. 33, No. 11 (1997), pp. 15-17, (English translation provided).
H. Vogg et al, "Thermal Behavior of PCDD/PCDF in Fly Ash From Municipal Incinerations", Chemosphere, vol. 15, Nos. 9-12, pp. 1373-1378.
Database WPI, Derwent Publications, AN 95-166508, JP-A-07 088 329, Apr. 4, 1995.
Ida Kazutaka
Kadowaki Kiyoshi
Kaneko Mitsuyuoshi
Kawaguchi Hajime
Kiyono Ken-ichi
Ebara Corporation
McMahon Timothy
Mitsubishi Chemical Corporation
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